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(No Model.) 1 R. MUNROE.

BOILER. I No. 322,120. Patented July 14,1885.

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. ROBERT MUNEoE, or ALLEGHENY, PENNSYLVANIA.

BOILER.

SPECIFICATION forming part of Letters Patent No. 322,120, dated Jiily 14, 1885.

Application filed April 3, 1885. (No model.)

To all whom/it may concern:

Be it known that I, ROBERT MUNROE, of Allegheny, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Boilers; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to an improvement in boilers; and it consists in the peculiar construction hereinafter described.

To enable others skilled in the art with which my invention is most nearly connected to make and use it, I will proceed to describe its construction and operation.

In the accompanying drawings, which form part of this specification, A represents the shell of the boiler, having an inner shell, B 0. Within the shell 0 is a fire-chamber, D, E being the fire-door of said chamber, which communicates with a chamber, F, by means of fiues G, said chamber F communicating with an outer heat-chamber, H, by means of fines I.

Within the case B, and extending from the top of the boiler to the crown of the firechamber, is a cylinder, J, which is employed as a magazine for supplying the fire-chamber with fuel. To the lower end of said cylinder is attached a casting, for the purpose of keeping the lower end from burning of. The fiues G are secured in the crown K of the fire-chamher, and in the sheet L; and the fines I are secured in said sheet L and the'lower end sheet, M, in the usual manner of securing fines. The cylinder J is detachable and removable, and is provided with a cap, N. Near the upper end of the cylinder are apertures P, for the escape of gas from said cylinder down into chamber F in the space between said cylinder and inner case, B, and is carried off through flue I into the heatchamber H, and out at the exit-flue 0 into the stack.

The outer walls, Q, are constructed of masonry, if so desired, and may be constructed of sheet metal. The construction of the outer walls, Q, and of the boiler, hereinbefore described, will readily be comprehended and understood by the skillful boiler-maker from the foregoing description, and by reference to the accompanying drawings.

The operation is as follows: Fire being kindled in the fire-chamber D, the fuel-such as anthracite coal or other fuel'is charged into the'cylinder J, the cap N being removed for that purpose. The smoke, gases, and heat, performing their office in the fire-chamber, pass up into the fire-chamber F through the flues G, then pass from the chamber F down through the flues I into the heat-chamber H, which surrounds the outer case, A, of the boiler, and, finally, pass out through the fiue 0 into the stack.-

The advantage of the hereinbefore described construction of boiler or steam-generating device consists in the large area of surface subjected to the action of the heatof the firechamber and fiues and chamber F, and finally utilizing the heat around theboiler-shell A in the the upper end of the boiler to the top of the chamber F, and the detachable magazine, whereby access is afforded to the chamber F, substantially as described.

2. The combination of the furnace D, chamher F, flues G, tube or shell B, between the upper end of the boiler and the chamber F, the magazine J, perforated near itsupper end, and the return-passage to the chamber F,

formed by the walls of the tube and the magazine, substantially as described.

3. The combination of the furnace D, chamber F, fines G, tube B, magazine J, perforated near its upper end, the return-passage to the chamber F, the flues I, and the heat-chamber H, surrounding the boiler, substantially as described.

In testimony whereof I have hereunto set my hand this 2d day of February, A. D. 1885.

I ROBERT MUNROE. Witnesses:

A. O. JOHNSTON, O. S. J OHNSTON.

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